Restoring the original tests for market breadth, on-balance volume, and trendlines

A conceptual-hygiene drill

By the late 1980s, overbought and oversold were commonly used to mean only that price had moved a relatively large amount in a relatively short time. Earlier technicians treated those words as a judgment that buying or selling was exhausted for the foreseeable future, with a sharp nearby reversal in prospect. High velocity was only one test among several. High price velocity by itself was not regarded as evidence of a reversal.

Editorial reading: before treating market breadth, on-balance volume, or a trendline break as a reversal signal, restore that older multi-test meaning. Ask for exhaustion, confirmation, and volume structure. Do not accept a single high-velocity chart label as the whole case.

Market breadth is not a one-split stamp

Market breadth is a signal built from advancing versus declining issues and related imbalance measures, read against price-index structure. Advance-decline counting is documented in a 1901 market commentary and in a 1926 presentation of counting the number of advances and declines.

A 25-day plurality index that totals the difference between advances and declines without regard to which side predominates is presented as a forerunner of many later daily and weekly breadth indices. It is also presented as a corollary of a broader equalization theory.

Several advance-decline versus price-index divergences appeared during the 1982-87 advance. A later late-1987 divergence therefore carried less force on opinion after the earlier alarms. Repeated earlier splits can blunt later opinion even when a later split is the one that matters.

On-balance volume arrived earlier than later classroom versions

On-balance volume is a cumulative volume construction that assigns session volume to the direction of the price change. It appears in instructional materials from 1934 and 1955 that predate a later independent popularization. Those earlier treatments are described as more complex than later versions.

Editorial reading: a later, simpler classroom stamp is not the same object as the earlier volume-structure work. Do not treat on-balance volume as a single high-velocity confirmation label.

A trendline break is still only a chart condition

A trendline is a constructed line along successive highs or lows. A still-circulating charting text italicizes, in its tactics discussion, that a trendline break is not evidence of a reversal. That warning sits contrary to a widespread later reading of trendline breaks.

Editorial reading: a break is a repeatable chart condition. It still needs a separate, falsifiable reversal hypothesis.

What neglecting the earlier record costs

The essay argues that neglecting earlier technical writing leaves practitioners with thinned concepts, incorrect ideas of who developed which tool, and repeated work on already-mapped ground, including in futures analysis.

Non-confirmation is the idea that one average failing to confirm another is meaningful. Later teaching often assigns this principle to an earlier writer who did not state it.